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Write the Electronic Configuration of K and Ne. - Science and Technology 1

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प्रश्न

Write the electronic configuration of K and Ne.

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उत्तर

Element Electronic configuration
K 2,8,8,1
Ne 2,8
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2013-2014 (March)

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संबंधित प्रश्न

The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table. Answer the following questions, giving justification in each case:-

(i) Write the group to which these elements belong.

(ii) Name the least reactive element.

(iii) Name the element having largest atomic radius.


An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.


Two elements ‘A’ and ‘B’ belong to the 3rd period of Modern periodic table and are in group 2 and 13, respectively. Compare their following characteristics in tabular form:-

(a) Number of electrons in their atoms

(b) Size of their atoms

(c) Their tendencies to lose electrons

(d) The formula of their oxides

(e) Their metallic character

(f) The formula of their chlorides


How many groups and periods are there in the modern periodic table?


List any two properties of the elements belonging to the first group of the modern periodic table.


What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?

(i) Number of valence electrons

(ii) Number of occupied shells

(iii) Size of atoms

(iv) Metallic character of element

(v) Effective nuclear charge experienced by valence electrons


Consider two elements 'A' (Atomic number 17) and 'B' (Atomic number 19) :

(i) Write the positions of these elements in the modern periodic table giving justification.

(ii) Write the formula of the compound formed when 'A' combines with 'B.'

(iii) Draw the electron dot structure of the compound and state the nature of the bond formed between the two elements.


Write any one difference in the electronic configurations of group-1 and group-2 elements ?


Use the letters only written in the Periodic Table given below to answer the questions that Follow :

1) State the number of valence electrons in atom J.

2) Which element shown forms ions with a single negative charge?

3)Which metallic element is more reactive than R?

4) Which element has its electrons arranged in four shells?


The following table shows the electronic configuration of the elements W, X, Y, Z:

Element w x y z
Electronic
configurations
2, 8, 1 2, 8, 7 2, 5 1

Answer the following questions based on the table above:

1) What type of Bond is formed between :

a) W and X

b) Y and Z

2) What is the formula of the compound formed between :

a) X and Z

b) W and X


How does the valency of elements change of moving from left to right in the third period of the periodic table?


Fill in the blank in the following statement:

In going across a period (right to left) in periodic table, the atomic size of the atom ...............


Fill in the blank in the following statement:

On moving form right to left in the second period, the number of valency electrons ...............


The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

 


How does the electropositive character of elements change on going down in a group of the periodic table?


Which of the following element does not lose an electron easily?

(a) Na
(b) F
(c) Mg
(d) Al


The element which has the maximum number of valence electrons is:
(a) Na
(b) P
(c) Si
(d) A


Which one of the following does not increase while moving down the group of the periodic table?


An element X belong to 4th period and 17th group, state.

name of the element.


An element X belong to 4th period and 17th group, state.

Write the formula of the compound formed when it reacts with `(27)/(13) y `


How does the number of:
valence electrons and 


An element X belong to 3rd periods and group II of the periodic table state: 

the number of valence electrons,


An element X belong to 3rd periods and group II of the periodic table state:

name of the element,


Complete the following sentences

The similarities in the properties of a group of elements are because they have the same …………………


An element 'M' has atomic number 11.

(a) Write its electronic configuration.

(b) State the group to which 'M' belongs.

(c) Is 'M' a metal or a non-metal.

(d) Write the formula of its chloride.


What will be the valency of an element of atomic number 9 (nine)?


Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table. 


How could the atomic radius of a noble gas be compared with the other elements in a period?


The elements of one short period of the periodic table are given below in order from left to right:
Li  Be  B  C  O  F Ne
(a) To which period do these elements belong?
(b) One element of this period is missing. Which is the missing element and where should it be placed?
(c) Place the three elements, fluorine, beryllium and nitrogen, in the order of increasing electro negativity.
(d) Which one of the above elements belongs to the halogen series?


An  element Z has atomic number 16. Answer the following
(a) State the period and group to which Z belongs
(b) Is Z a metal or a non-metal?
(c) State the formula between Z and hydrogen. 
(d) what kind of a compund is this?


Arrange the following as per instruction given in the bracket.

Cs, Na, Li, K, Rb (decreasing electronegativity) 


Atomic numbers of elements A, B, C, D, E, F are 8, 7, 11, 12, 13 and 9 respectively. State the type of ions they form. 


State the nature of compounds formed when group 17 elements combine with (i) metals (ii) non-metals.


Going across a period left to right, atomic size _____.


Based on the group valency of element write the molecular formula of the following compound giving justification:
Oxide of first group elements.


Based on the group valency of element write the molecular formula of the following compound giving justification:

Halide of the elements of group thirteen


State the property trends in general of elements on moving from left to right in a period of the periodic table.


Name or state following with reference to the element of the first three periods of the periodic table.

A non-metal in period 2 which is tetravalent.


State the following:

The group to which the element with an electronic configuration of 2, 8, 2 belongs.


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